摘要
通过沉淀法合成羟基磷灰石(HA)和碳酸根掺杂的羟基磷灰石(CHA),利用XRD和TEM对产物的结构和形貌进行表征,并对比研究了HA和CHA对氟离子的吸附行为。吸附实验的结果表明,碳酸根掺杂能提高HA作为环境友好型除氟材料的吸附能力,但并未改变吸附类型。吸附均为一个自发的(ΔG^0<0),吸热(ΔH^0>0),熵增(ΔS^0>0)的过程;对比吸附等温线的拟合效果,Langmuir优于Freundlich模式;吸附动力学过程符合拟二级动力学模型。
Hydroxyapatite（HA） and Carbonate hydroxyapatite（CHA） were synthesized by precipitation method. The structures and morphologies of products were characterized by XRD and TEM. The comparative analysis on adsorption behavior of HA and CHA on fluoride ion was studied. Carbonate substitution can improve the F-adsorption performance of apatite as environment-friendlydefluoridation material, but it does not change the adsorption type. Adsorption process is a spontaneous reaction（ΔG0 〈0） process of endothermic（ΔH0 〉0） and entropy increasing（ΔS0 〉0） Compared with the fitting effect of adsorption isotherm, the Langmuir model was superior to Freundlich model. The adsorption kinetics process fits well to pseudo second dynamic model
出处
《中国陶瓷》
CSCD
北大核心
2017年第12期16-21,共6页
China Ceramics
基金
国家自然科学基金(51462014)
江西省教育厅科研项目(GJJ160868)
关键词
除氟
羟基磷灰石
碳酸根掺杂
吸附热力学
吸附动力学
Defluoridation
Hydroxyapatite
Carbonate substitution
Adsorption thermodynamics~ Adsorption kinetics
